Hi Linda,
It should just work - there are no settings to turn this feature on or off.
The only other thing I can think of is that you can select which customers to run this for, at the bottom half of the Calculate Customer Aging screen. You could choose all customers, those that belong to a certain report group or a range of Account Sets, and so on. Perhaps there is something there that isn't selecting any customers, or not selecting the customers that you are looking at. Ensure that all of the ranges are from 'blank' to 'zzzzzz' instead of 'blank to 'blank'.
Perhaps also look at the field 'Aged as of' on the same Customer grid/file, as it gets written to by the same process. If it doesn't have today's date, then something isn't allowing the customer records to be updated.
Ensure that all buckets Aged 1 to Aged 4 are present. If you age by Due Date and the amount is over 90 days, it will appear in the Aged 4 bucket.
Perhaps also try with sample data, so you can see if it works there.
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Regards,
Softrak Tech Support